A patent has been filed by Kurt Shafer for the first Hybrid Turbine Rooftop Ventilator to be built in America.
The design is ideal for both residential and industrial/commercial buildings. The whole house fan implementation is described in detail at http://www.ThorwaldsonWholeHouseFans.com
It is a 20 inch diameter throat with a 24 inch diameter vertical bladed turbine on top for rain proofing. Inside the throat is a high performance high efficiency EC motor turning a propeller with 8 blades at a 50 degree angle bite.
The motor has infinitely variable speeds and is capable of running at just 100 RPM at about 50 watts. At full speed it pulls just 505 watts.
This invention was posted on the internet in September of 2016 and the first order came in 4 days later from a couple in a small home in the Mt. Washington area of Los Angeles.
Thorwaldson also has the highest performance rafter mounted whole house fan, the ES-6400. It offers more air flow at lower input power than any other on the market. It pulls 6,320 CFM at 505 watts or 12.5 CFM/W.
The ES-6400 is priced at the lowest price based on air flow per penny spent - 28 cents per CFM.
The ER-8000 rooftop has no competition but is also just 28 cents per CFM.
Call Kurt at 951 296 3611 for more information and to discuss his need for installers and dealers all over the US.